Bronuction



l -Eample 4 the same conditions-the purestaluiriiniunoxide` (A1203) only yields v50 grams of acetaldehyde per ZO`- ZDSY W3+ A1203 CdO MOO3 A1203,

hour, and soon becomes inactive. Y

Example "5V Each 500 grams of alumina' Whichfhasv been 1 mixed with 1.2 per cent its Weight of copper oxide (CuOla're deposited on each F1500 grams ofpumf ice'granules. The mass obtained `is'then treated With hydrogen for 5 hours at 350 to 400C. A mixture ofY steam and acetylene in theratio off/l J'oxide (COO)A the yield decreases but by substitilting nickelfor the copper oxide 100 grams ofA acetaldehyde areobtained-from each 100G-litersV` of the gases per hour at a temperature asloyv ,asv-

300C. 1 l' 'Eample 6 n ,Y

`llachOO grams of mixtureqof 97 per cent by Weight of alumina and' 3 per cent 'byweight of Azinc oxide (ZnO) vareintimately' mixed Withre'ach Y 1,1500 grams rof pumice and 42000liters' o'fe-ainix-v y'tuin-eroi l part of Aacetylene V and 14 parts of steam Aare passedper hour over Veachbatchof the aforefl v saidV catalytic masswat400f 0.1,.' Almost 200 grams y g, 400 grams of Saluminium cx'idefandulOO grams cent of the acetylene employed. n Similar good rei. sults are obtained when `the zincphosphate is reof acetaldehydeare,obtainedperhour.,` Th'ezin,

joxide may be replaced by the same quantity;fof Y cadmium oxide (CdO)"or by one, thirdlof thel l zinc oxide of copper oxide (CuO).' '-f l Example ofyzinc phosphate (Zns (P04) z) aremixedvvith 1000 grams of @steam 'arethen ,passed at from v365)"v to 370" C.; per hour overV the" aforesaid catalytic per'hourvvhich corresponds; to a'yield of 33, per

placed by cadmium phosphate (Cd3(PO4) A mixed with 3 85 vgramsfoiialuminiull,Qxidefand '.depositedjon 1500 Agrams of' pumice granules -whereupon 400 liters Offacetylene and 1600 grams y y'500 grams yof a catalystl'rconsistingcf 0.Gfpartj by; Weight of. zincjoxide (ZnO), ll part ci tungj .offsteam arepassedwper hour and at fromy 350 to 360 Clover thesaid catalytic mass. vThe yield:Y

sten oxide (Woe) and aparte-efaluminium oxide 4(A1203) are deposited; eri 2000 grams of,y

pumice `whereupon `SQILjlitersjjfof acetylene 'and k 1200 "grams of steamare passed per houryand Iat about 350 C. evernie/eateiytic'nass frsvsgrams to 1 volumes is passed at400 C. over the catalytic mass whereby 150 grams of acetaldehyde areobtained per hour, i.: e. a yield of- 40 per rcent Aof Y, the theoretical yield calculated on the acetylene- :By replacing the copper oxide (C) by cobalt` vh'eavy metal s y I atingV action on organic substances.

grams of pumice.V f 300 litersV of acetylene and '12005 of acetaldehyde are obtained per hour which may be collected as an aqueous solution. By returning the acetylene, Which has not been converted obtained with catalytic masses the active constituents 4oi which consist of ZnO-MoO3-Al2O3,

zinc cliromatie-A1203` (ZnCrO4-Al2O3) cadmium :Ecliremate-finos,` (CdCrO4-Al2O3) and the like.

'What "We" claim c is :1- a The: process for the. production of acetalde- Yhydevhich comprises'contacting a mixture conf tainingacetyleneand steam, While heating,with

va catalytic substance comprising anhydrous alu- S'Ininiuni.oxide activated by a substance comprising lafsolid, heavy metal, said substance having a '.dehydrogenating actionon organic substances;

The process for the production of acetaldey hyde'vvhich` comprises :contacting a mixture con- I taining acetylene and steam,V while heating, with a catalytic substance comprising anhydrousl alurminium oxide activatedV by a compound of a solid',

which compound has a dehydrogenV 3*. Theproc'essfor the production of acetalde-" l hyde which comprises contacting a mixture containing acetylene and steam,` While heating, with a catalytic substance comprising anhydrous alu-v mini'um oxide activated by a compound of solid,

heavy metal with a metalloidof the' sixth group of the periodic systemfr'which-.compound has a dehydrogenatingjactionon organic substances,

lili

4. The process for thc-,production of 'acetaldehyde which vcomprisesY contacting `a mixture con taining acetylene and steam, vWhile heating,V with acatalyticjsubstance comprising anhydrous alu- .miniumoxidefactivated by a'compound of asolid,

:of the periodic system. '-H

5. rrile process furthe p'reduction @facet-aide'- hydewhichc'omprises contacting a mixture containinggacetylene and steam, While; heating, 'with a catalytic substance 'comprising anhydrous aluminium oxide' activated byy a Acompoundiofja solid, heavy metalzwith a metalloid of the'sixth group of the periodic system, which compound has a dehydrogenatingl action on organic Ysubstances,

I Y and by aj heavy metal selected from lgroups one ff and eightcfjf the periodic system.

1`1 5 gramsjoffcadmi'um 'tungstate (CdWOO are 6., Th'e process for the production.ofacetaldesolidi,v heavy metals 'of the, second groupof the periodic 1 system With' a"meta1loid of the -sixth group'y off the 'periodic ssyst'em, which ycompound has,fmdehydmgenating actionv on organic sub stances.

7. Ifhefjprocessfor the productionof acetaldee hydewhich'comprises contacting a mixture con.-

I taining acetyleneand steam, While heating, With 4a catalytic, 'substance.comprising anhydrous alu,-L

miniu'rii oxide Vactivated by a 'sulphide of a solid,v

ingaction'onorganic substances.l j Y, l i 8. The, process for the production of acetaldeheavy'metal Awhich sulphide has a dehydrogenathyde which comprises contacting a ymixtureconftaining' acetylene, and steam, While heating, with a catalytic substance comprising anhydrous a1u` 'l 13. Theprocess for the production of acetalde'- minium oxid activated by a tungstic compound oa solid heavy A,metal of thesecond lgroup ofthe periodic system.' Y f i v 9. The process'for theproductionY ofacetaldehyde which comprises contactingamixture con-v taining acetylene and steam, While .heatinggwith a catalytic substance comprisingl anhydrous aluminium oxide activated by a compoundof a solid,

hyde which comprises contacting a mixture con-V taining-acetylene and steam, whileheating'withi a catalytic substance comprisinganhydrous alu` minium oxideactivated by a compound of a solid,

heavy metal ofthe second group with an acid selected from the group consisting of tungstic, molybdic and chrornic acids.4`

hyde which comprises contacting a mixture containing acetylene and steam, `whileheating, with aY catalyticsubstance comprising anhydrous aluf` .miniurn oxideV activated by a compound of` zinc,

whichcompound has a dehydrogenating action jon Y. y ,jminium oxide activated by Zinc'tungstate;V offacetalde.- hydewhich comprises contacting a'mixture con`V organic substances.

1-2. ,The process for thel production taining acetylene and steam, while heating, with a catalytic substance `comprising' anhydrous `alu- .zninium 'oxide activated` by a compoundv of Zinc With a metalloid of the sixth group of theperiodic system, which compound has a dehydrogenating action on organic substances. i

' a catalytic substancecomprising anhydrous aluminium oxide activated by zinc' oxide,"

hyde Which comprisescontacting a mixture con-` soapy@- 14. The process furthe production of acetaldehyde which comprises contacting amixture con' taining acetylene and steam, While heating at be-- tween 150" and 500Y C., with a catalytic substance comprising anhydrousaluminium oxide activated by alsubstance comprising `al solid, heavy metal,

said substance' having a dehydrogenatingk actionv .f1

on organic substances. ,Y Y .15.The process for the'production of acetaldehyde which comprises contacting a mixture conacid selected from the group consisting Ortungstic, molybdic and chromic acids.`

16. VThe process forthe production ofV acetaldehyde Which comprises'contactin'g a mixture con'- taining acetyleneand steam, While heating, with a catalytic substance lcomprising anhydrous alu- 17; The process for the .productionof acetaldef taining acetylene'and steam; While heating at between 250 and 400 C., with a catalytic substanceI Y MARTiNLUTHER; n

.hyde which comprisescontacting a mixture con* Y K taining acetylene and steam, while heating, at .A

' between 250 and V400 C., withy a catalytic. sub- 1stanc'e 4 comprising anhydrous aluminium oxideA f n activated by a compound ofra solid heavy metalV Y f ofthe second group of the periodic system with an Y 95 Y 11.-The processfcr the `production of acetalde* Y 

